Includes bibliographical references (p. 293-301) and index

Introduction : a clock on the heath -- The sources of variation -- Conserved cells, divergent organisms -- Physiological adaptability and evolution -- Weak regulatory linkage -- Exploratory behavior -- Invisible anatomy -- Facilitated variation -- Is life plausible? -- Glossary

"In a new theory they call "facilitated variation," Kirschner and Gerhart elevate the individual organism from a passive target of natural selection to a central player in the three-billion-year history of evolution. In clear, accessible language, the authors invite every reader to contemplate daring new ideas about evolution. By closing the major gap in Darwin's theory Kirschner and Gerhart also provide a timely scientific rebuttal to critics of evolution who champion "intelligent design.""--BOOK JACKET

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